Monsoon predicted date (20-May-09) may change due to the present moisture from the north-west called the western disturbance.
Going by the latest water vapor shot...
One can clearly view the push of moisture from the north-west. A DRY ridge can be seen between the two moisture systems. Comparing with previous (5 days back) water vapor images, one would have noticed a clear push of moisture from South-Arabian sea. Now as per today that moist air current from South-west has died down.
Even the cloud formations over the south-Arabian sea around 5th parallel has also disintegrated.
This may suggest a delay in monsoon. It may not set in over southern India as predicted before on 20-May-09.
"COLA/NCEP" predictions say that the monsoon will set in between 20-May-09 and 27-May-09.
Anyway we'll keep monitoring the various factors and keep the viewers updated.